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Enrichment of selected serum fatty acids after a small oral dosage of (1‐ 13 C)‐ and (8‐ 13 C)triolein in human volunteers analysed by gas chromatography/combustion isotope ratio mass spectrometry
Author(s) -
Metges Cornelia C.,
Kempe K.,
Wolfram G.
Publication year - 1994
Publication title -
biological mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1052-9306
DOI - 10.1002/bms.1200230509
Subject(s) - triolein , chemistry , chromatography , oleic acid , isotope ratio mass spectrometry , gas chromatography–mass spectrometry , linoleic acid , δ13c , mass spectrometry , fatty acid , stable isotope ratio , biochemistry , lipase , enzyme , physics , quantum mechanics
In this study the fate of 100 mg orally administered (1‐ 13 C)‐ and (8‐ 13 C)triolein was traced in the serum lipids of four healthy human subjects. After an overnight fast the subjects consumed hourly meals of a liquid formula diet over 12 h. Ninety minutes after the first meal in the first study (1‐ 13 C)triolein was given and in the repeat study the same subject received (8‐ 13 C)triolein. Triacylglycerol (TG), phospholipid (PL) and cholesterol ester (CE) were isolated from serum sampled prior to and in intervals after isotope administration. Fatty acid composition of serum lipids was measured using gas chromatography/mass spectrometry. 13 C enrichment in palmitic, stearic, oleic and linoleic acids of these fractions was determined by gas chromatography/isotope ratio mass spectrometry. With (8‐ 13 C)triolein a significantly higher enrichment (peak +17.1 ± 14.3% δ 13 C) was found in the oleic acid of TG fraction than with (1‐ 13 C)triolein (peak −7.1 ± 4.2%), which may be due to a faster elimination of (1‐ 13 C)oleic acid from serum TG. 13 C enrichments in the other fatty acids of the TG fraction as well as of PL and CE fractions were in the range of natural 13 C abundance (−25 to −32%).